含煤矸石烧结砖的淋滤及地球化学行为。
Leaching and geochemical behavior of fired bricks containing coal wastes.
机构信息
Mohammed VI Polytechnic University, Materials Science and Nano-engineering Department, Lot 660, Hay Moulay Rachid, 43150, Ben Guerir, Morocco; Université du Québec en Abitibi-Témiscamingue (UQAT), 445 boul de l'Université, Rouyn-Noranda, J9X 5E4, QC, Canada.
Université du Québec en Abitibi-Témiscamingue (UQAT), 445 boul de l'Université, Rouyn-Noranda, J9X 5E4, QC, Canada.
出版信息
J Environ Manage. 2018 Mar 1;209:227-235. doi: 10.1016/j.jenvman.2017.12.060. Epub 2018 Jan 4.
High amounts of mine wastes are continuously produced by the mining industry all over the world. Recycling possibility of some wastes in fired brick making has been investigated and showed promising results. However, little attention is given to the leaching behavior of mine wastes based fired bricks. The objective of this paper is to evaluate the geochemical behavior of fired bricks containing different types of coal wastes. The leachates were analyzed for their concentration of As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, Zn and sulfates using different leaching tests; namely Tank Leaching tests (NEN 7375), Toxicity Characteristic Leaching Procedure (TCLP) and pH dependence test (EPA, 1313). The results showed that the release of constituents of potential interest was highly reduced after thermal treatment and were immobilized within the glassy matrix of the fired bricks. Moreover, it was also highlighted that the final pH of all fired samples changed and stabilized around 8-8.5 when the initial pH of leaching solution was in the range 2.5-11.5. The release of heavy metals and metalloids (As) tended to decrease with the increase of pH from acidic to alkaline solutions while Mo displayed a different trend.
全世界的采矿业都在不断产生大量的矿山废物。一些废物在烧制砖中的回收利用可能性已经得到了研究，并显示出了有希望的结果。然而，基于烧制砖的矿山废物浸出行为却很少受到关注。本文的目的是评估含有不同类型煤矸石的烧制砖的地球化学行为。使用不同的浸出试验，即槽浸试验（NEN 7375）、毒性特征浸出程序（TCLP）和 pH 依赖性试验（EPA，1313），对浸出液中的 As、Ba、Cd、Co、Cr、Cu、Mo、Ni、Pb、Zn 和硫酸盐的浓度进行了分析。结果表明，热处理后潜在有价值成分的释放得到了高度抑制，并被固定在烧制砖的玻璃基质中。此外，还强调了当浸出溶液的初始 pH 值在 2.5-11.5 范围内时，所有烧制样品的最终 pH 值都发生了变化，并稳定在 8-8.5 左右。重金属和类金属（As）的释放随着从酸性到碱性溶液 pH 值的增加而趋于减少，而 Mo 则表现出不同的趋势。
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